JavaScript access control external CSS and browser version judgment

Last Update:2013-12-01 Source: Internet

Author: User

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In fact, many or most CSS files describe webpages as external CSS. Therefore, when Javascript is required to change CSS

When the dynamic effect occurs, JS has to access external CSS. Next we will discuss the example of JS access to external CSS.

In this example, click the button to trigger the event to change the background color of the DIV. First, check the CSS file.

[Css]
. Style1 {
Width: 400px;
Height: 500px;
Background-color: red;
}
. Style1 {
Width: 400px;
Height: 500px;
Background-color: red;
}
Then the HTML file

[Html]
<! Doctype html public "-// W3C // dtd html 4.01 Transitional // EN">
<Html>
<Head>
<Title> test.html </title>

<Meta http-equiv = "keywords" content = "keyword1, keyword2, keyword3">
<Meta http-equiv = "description" content = "this is my page">
<Meta http-equiv = "content-type" content = "text/html; charset = UTF-8">

<Script type = "text/javascript">
Function test (eventObj ){
// Obtain all class selectors in mycss.css
// This 0 indicates the first css introduced in the HTML page.
Var cssResult = document. styleSheets [0]. rules;
// Obtain the specified CSS class selector according to the subscript
Var style1 = cssResult [0];

If (eventObj. value = "black "){
Style1.style. backgroundColor = "black ";
} Else {
Style1.style. backgroundColor = "red ";
}
}

Function test1 (){
If (window. XMLHttpRequest ){
If (! Window. ActiveXObject ){
Alert ("Mozilla, Safari ");
} Else
Alert ("IE ");
} Else {
Alert ("IE6 ");
}
}
</Script>
<Link rel = "stylesheet" href = "../css/6.css" type =" text/css "> </link>
</Head>

<Body>
<Div id = "div1" class = "style1"> div1 </div>
<Input type = "button" value = "black" onclick = "test (this);"/>
<Input type = "button" value = "red" onclick = "test (this);"/>
<Br/>
<Input type = "button" value = "check browser version" onclick = "test1 ();"/>
</Body>
</Html>
<! Doctype html public "-// W3C // dtd html 4.01 Transitional // EN">
<Html>
<Head>
<Title> test.html </title>

<Meta http-equiv = "keywords" content = "keyword1, keyword2, keyword3">
<Meta http-equiv = "description" content = "this is my page">
<Meta http-equiv = "content-type" content = "text/html; charset = UTF-8">

<Script type = "text/javascript">
Function test (eventObj ){
// Obtain all class selectors www.2cto.com in mycss.css.
// This 0 indicates the first css introduced in the HTML page.
Var cssResult = document. styleSheets [0]. rules;
// Obtain the specified CSS class selector according to the subscript
Var style1 = cssResult [0];

If (eventObj. value = "black "){
Style1.style. backgroundColor = "black ";
} Else {
Style1.style. backgroundColor = "red ";
}
}

Function test1 (){
If (window. XMLHttpRequest ){
If (! Window. ActiveXObject ){
Alert ("Mozilla, Safari ");
} Else
Alert ("IE ");
} Else {
Alert ("IE6 ");
}
}
</Script>
<Link rel = "stylesheet" href = "../css/6.css" type =" text/css "> </link>
</Head>

<Body>
<Div id = "div1" class = "style1"> div1 </div>
<Input type = "button" value = "black" onclick = "test (this);"/>
<Input type = "button" value = "red" onclick = "test (this);"/>
<Br/>
<Input type = "button" value = "check browser version" onclick = "test1 ();"/>
</Body>
</Html>

[Html]
Function test (eventObj ){
// Obtain all class selectors in mycss.css
// This 0 indicates the first css introduced in the HTML page.
Var cssResult = document. styleSheets [0]. rules;
// Obtain the specified CSS class selector according to the subscript
Var style1 = cssResult [0];

If (eventObj. value = "black "){
Style1.style. backgroundColor = "black ";
} Else {
Style1.style. backgroundColor = "red ";
}
}
Function test (eventObj ){
// Obtain all class selectors in mycss.css
// This 0 indicates the first css introduced in the HTML page.
Var cssResult = document. styleSheets [0]. rules;
// Obtain the specified CSS class selector according to the subscript
Var style1 = cssResult [0];

If (eventObj. value = "black "){
Style1.style. backgroundColor = "black ";
} Else {
Style1.style. backgroundColor = "red ";
}
} This function indicates that the meaning of the function has been introduced. It should be said that it is a good way to access external CSS. Of course, browser compatibility is required.

Judge the browser version. The test1 () function illustrates this by using the spatial support of ActiveX windows. In fact, it should be more comprehensive.

From a352193394

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

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JavaScript access control external CSS and browser version judgment

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